[irgen] Make HasAArch64TBI an IRGen option instead of a LangOpts.

With some changes that I am making, we will no longer need this flag at the SIL
level, so we can just make it an IRGen flag (which it really should have been
in the first place).

(cherry picked from commit 361e63c)

Author: gottesmm

include/swift/AST/IRGenOptions.h

@@ -604,6 +604,9 @@ class IRGenOptions {
   /// Paths to the pass plugins registered via -load-pass-plugin.
   std::vector<std::string> LLVMPassPlugins;
 
+  /// Set to true if we support AArch64TBI.
+  bool HasAArch64TBI = false;
+
   IRGenOptions()
       : OutputKind(IRGenOutputKind::LLVMAssemblyAfterOptimization),
         Verify(true), VerifyEach(false), OptMode(OptimizationMode::NotSet),
@@ -649,13 +652,12 @@ class IRGenOptions {
         UseFragileResilientProtocolWitnesses(false), EnableHotColdSplit(false),
         EmitAsyncFramePushPopMetadata(true), EmitTypeMallocForCoroFrame(true),
         AsyncFramePointerAll(false), UseProfilingMarkerThunks(false),
-        UseCoroCCX8664(false), UseCoroCCArm64(false),
-        MergeableTraps(false),
+        UseCoroCCX8664(false), UseCoroCCArm64(false), MergeableTraps(false),
         DebugInfoForProfiling(false), CmdArgs(),
         SanitizeCoverage(llvm::SanitizerCoverageOptions()),
         TypeInfoFilter(TypeInfoDumpFilter::All),
         PlatformCCallingConvention(llvm::CallingConv::C), UseCASBackend(false),
-        CASObjMode(llvm::CASBackendMode::Native) {
+        CASObjMode(llvm::CASBackendMode::Native), HasAArch64TBI(false) {
     DisableRoundTripDebugTypes = !CONDITIONAL_ASSERT_enabled();
   }
 

include/swift/Basic/LangOptions.h

@@ -652,9 +652,6 @@ namespace swift {
     bool RestrictNonProductionExperimentalFeatures = false;
 #endif
 
-    /// Set to true if we support AArch64TBI.
-    bool HasAArch64TBI = false;
-
     bool isConcurrencyModelTaskToThread() const {
       return ActiveConcurrencyModel == ConcurrencyModel::TaskToThread;
     }

lib/DriverTool/sil_llvm_gen_main.cpp

@@ -167,6 +167,7 @@ int sil_llvm_gen_main(ArrayRef<const char *> argv, void *MainAddr) {
   IRGenOptions &Opts = Invocation.getIRGenOptions();
   Opts.OutputKind = options.OutputKind;
   Opts.DisableLegacyTypeInfo = options.DisableLegacyTypeInfo;
+  Invocation.computeAArch64TBIOptions();
 
   serialization::ExtendedValidationInfo extendedInfo;
   llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> FileBufOrErr =

lib/Frontend/CompilerInvocation.cpp

@@ -384,7 +384,7 @@ void CompilerInvocation::computeAArch64TBIOptions() {
   auto &LLVMArgs = getFrontendOptions().LLVMArgs;
   auto aarch64_use_tbi =
       std::find(LLVMArgs.begin(), LLVMArgs.end(), "-aarch64-use-tbi");
-  LangOpts.HasAArch64TBI = aarch64_use_tbi != LLVMArgs.end();
+  IRGenOpts.HasAArch64TBI = aarch64_use_tbi != LLVMArgs.end();
 }
 
 void CompilerInvocation::computeCXXStdlibOptions() {